how can you just display the save as option
sorry this is no good either

the problem is that these client machines are on hot desks (others can use them) so if user 1 goes and downloads his payslip then user 2 could come along and see user1's details on the same machine. If the pdf is viewed then it is cached so if user2 had the skill he could browse the tmp files and see every payslip that had been downloaded

question

if you password protect a PDF can you pass the password through a link